Camshaft out of position

During the change of cambelt, for some reason or another, the camshaft ended up out of position, the locking pin has no change of going in..
My question is, if the crankshaft is where it supposed to be how can the camshaft be put back into position ? By taking the rocker cover off ?

Attachment 39470

Thanks

You have to take the belt off and refit it in the correct position.